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A 0.6V 785-nW Multimodal Sensor Interface IC for Ozone Pollutant Sensing and Correlated Cardiovascular Disease Monitoring.
- Source :
- IEEE Journal of Solid-State Circuits; Apr2021, Vol. 56 Issue 4, p1058-1070, 13p
- Publication Year :
- 2021
-
Abstract
- In this article, we present the design and analysis of a 785-nW multimodal sensor interface IC for ozone pollutant sensing and correlated cardiovascular disease monitoring based on electrocardiography (ECG) and photoplethysmography (PPG). The proposed hybrid dc offset current cancellation (DCOC) along with a 4-MΩ gain-regulated cascode transimpedance amplifier (RGC-TIA) enable PPG readout power reduction by 37 ×, compared with the state-of-the-art PPG sensor interfaces. The ozone sensing channel proposes an adaptive architecture to enable low V<subscript>DD</subscript> operation, achieving a 300 × power reduction, compared with the state-of-the-art gas sensing readouts. The ozone sensing channel’s performance was also verified using custom resistive metal-oxide sensors for concentrations from 50 to 900 ppb. The sensor interface IC is fabricated in a 65-nm CMOS, integrating a 165-nW voltage-mode ECG channel, a 532-nW current-mode PPG channel, 76-nW resistive-mode ozone channel, and 12.6-nW peripheral circuits, all at 0.6 V. The total system power consumption including the LED and a custom digital readout IC is 10.98– 5.51 μW, which is 41 × – 57 × less than prior ozone/CVD joint monitoring sensor interface systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189200
- Volume :
- 56
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- IEEE Journal of Solid-State Circuits
- Publication Type :
- Academic Journal
- Accession number :
- 149553182
- Full Text :
- https://doi.org/10.1109/JSSC.2021.3057229